AMC-103
4 PEAKTRONICS
POWER
Power is connected to the terminals marked LINE
and NEUTRAL. The unit does not have an earth ground
connection; earth ground should be connected to the body
of the actuator. The fuse installed on the unit is rated for
maximum output current that can be safely delivered by
the AC outputs. Replacement fuses must not exceed the
maximum rating of 2.5A in order to prevent damage to the
unit. Smaller fuse sizes can be used with smaller motors -
consult the actuator manufacturer for appropriate fuse size
and type.
MOTOR and FEEDBACK POT
The actuator motor and feedback potentiometer are
connected as shown in the block diagram. The OPEN ter-
minal should be connected to the motor winding that moves
the actuator toward the open position, and conversely, the
CLOSED terminal is connected to the winding that moves
the actuator toward the closed position. The COMMON
terminal is the neutral or common wire to the motor wind-
ings. The AMC-103 is suitable for powering most dynamic
brakes used with electric actuators; however, consult the
actuator manufacturer for more information.
The feedback potentiometer wiper must be con-
nected to the WIPER terminal. One end of the potenti-
ometer is connected to the +5V OUT terminal, and the oth-
er is connected to the GND terminal. The potentiometer
should be connected so that when the actuator moves to-
wards the open position, the potentiometer's resistance be-
tween the WIPER and GND terminals will increase. This
can also be measured as a voltage - the voltage between the
WIPER and GND terminals should increase when the actu-
ator moves towards the open position. If the potentiometer
is wired incorrectly, the typical response of the unit will be
to run the actuator to the full open or closed position, re-
gardless of the command signal input, and the correspond-
ing output indicator remains on.
The feedback potentiometer should be mounted to
provide a proper feedback signal through the entire range
between the open and closed positions. For best results,
position the actuator to the midway point between the open
and closed positions; then adjust the feedback potentiome-
ter for approximately 2.5 VDC (or 1/2 of the potenti-
ometer's resistance) between the WIPER and GND termi-
nals.
Since the feedback potentiometer is crucial for
proper operation of the AMC-103, the following items
should be carefully observed:
1 - Potentiometer resistance should be a value from
1K to 10K ohms.
2 - The potentiometer should be a linear taper type.
3 - The potentiometer must be properly wired to pro-
vide the correct feedback signal.
4 - The potentiometer must be properly and securely
mounted in order to provide a reliable feedback
signal.
COMMAND SIGNAL
An appropriate command signal, either 0-5V, 0-
10V, 4-20mA, or 1-5V, should be connected to the appro-
priate terminal (as shown in the Block Diagram) while
using the SIGNAL GND terminal as the return signal
ground. The AMC-103 must be configured for the type of
command signal that is to be used. Jumper plugs JP1 and
JP2 should be properly installed (as shown in the Outline)
prior to operating the unit.
+12V OUT
The +12V OUT terminal provides an auxiliary
+12VDC output that can be used to power a command
input 4-20mA transmitter, or a position feedback transmit-
ter (either 4-20mA or 0-5/10V). Note that only one
transmitter can be powered by the AMC-103. When pow-
ering a 4-20mA transmitter with the +12V OUT, care
should be taken to insure that the total resistance of all
devices connected in the 4-20mA loop does not exceed
300 ohms. See Wiring Diagrams for various applications.
OUTPUT INDICATORS
The AMC-103 has on-board indicators that identi-
fy when one of the motor outputs is turned on. When the
open output is turned on, the red LED indicator will turn
on, and when the close output is turned on the green LED
indicator will turn on (see Outline).
Many actuators are equipped with limit switches
at the open and closed positions that are intended to dis-
connect power to the motor to prevent mechanical dam-
age. For this reason, it is possible that the AMC-103 will
indicate that one of the motor outputs is turned on when
the actuator is not in motion. However, it should be noted
that when the indicator is on, power is applied to the mo-
tor output.
